Booleans

Booleans are True or False statements. Unlike strings or numbers, booleans store statements of truth: is what I’m saying true or false?

For example, if I say, “You are a robot”, a boolean can store whether this statement is true. In this case, since you are not a robot (hopefully!), False would be stored.

What are the boolean answers to these questions about you?

1. I am a human. _______
2. I have 25 fingers. _______
3. I like cookies. _______
4. My favorite color is blue. ______

The most common forms of boolean operators are comparisons like less than or greater than. How these are written in python are listed below.

Challenge 1

As usual, use print to print out your results to the following:

print(5 + 8 < 10)
print((3 + 5) * 6) == (65 - 17)

The first statement should return False. And the second should return True.

Challenge 2

Try printing out the answers to the following expressions using print. If the results for any of these statements don’t make sense, please ask for help!

• 54 < (10 + 32)
• (37 / 5) != 7
• “Hello” + “World” == “Hello World”
• False == False

Challenge 3

Try making your own expressions!

Fun Fact: Connecting Booleans with AND and OR operators

You can also connect boolean expressions together using the AND and the OR operator. Here’s a chart that describes what happens when we connect booleans together:

To summarize, AND requires both boolean expressions to be true, while OR only requires one of the two Boolean expressions to be true. Here are some more examples:

• (5 < 8) and (9 != 10) produces True since both 5 is less than 8 and 9 is not equal to 10.
• (8 <= 2) or (“h” + “e” == “he”) produces True since “h” + “e” results in “he”, even though 8 is not less than or equal to 2.
• (6 != 2 * 3) or (8 < 2 * 4) produces False since both 6 not equal to 2 * 3, and 8 being less than 2 * 4, produce False.

What do you think the following expressions produce?

• (11-2 < 10) and (7+3 > 10)
• (True or 3 < 1) and (False or 3>1)